package com.changgou.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.changgou.entity.PageResult;
import com.changgou.pojo.SkuInfo;
import com.changgou.search.service.SearchService;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.amqp.core.QueueBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class SearchServiceImpl implements SearchService {
    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;

    @Override
    public Map search(Map<String, String> searchMap) {

        Map<String,Object> resultMap= new HashMap<>();

      //构件查询
        if (searchMap!=null){
          //开启查询
           //参数1(条件构建对象)
            NativeSearchQueryBuilder nativeSearchQueryBuilder= new NativeSearchQueryBuilder();
            BoolQueryBuilder boolQuery= QueryBuilders.boolQuery();


            //按照关键字查询
           if (StringUtils.isNotEmpty(searchMap.get("keywords"))){
               boolQuery.must(QueryBuilders.matchQuery("name",searchMap.get("keywords")).operator(Operator.AND));
           }

           //按照品牌过滤查询
            if (StringUtils.isNotEmpty(searchMap.get("brand"))){
                boolQuery.filter(QueryBuilders.termQuery("brandName",searchMap.get("brand")));
            }

           //规格过滤查询
            for (String key : searchMap.keySet()) {
                if (key.startsWith("spec_")){
                    String value = searchMap.get(key).replace("%2B","+");

                    boolQuery.filter(QueryBuilders.termQuery(("specMap."+key.substring(5)+".keyword"),value));
                }
            }

            //按照价格查询
            if (StringUtils.isNotEmpty(searchMap.get("price"))){
                String[] prices = searchMap.get("price").split("-");
                if (prices.length==2){
                    boolQuery.filter(QueryBuilders.rangeQuery("price").lte(prices[1]));
                }
                boolQuery.filter(QueryBuilders.rangeQuery("price").gte(prices[0]));
            }


            nativeSearchQueryBuilder.withQuery(boolQuery);

            //品牌分组(聚合)查询
            String skuBrand="skuBrand";
            //设置聚合条件
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

            //规格聚合查询
            String skuSpec="skuSpec";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

            //分页查询
              //当前页
            String pageNum=searchMap.get("pageNum");
              //每页条数
            String pageSize=searchMap.get("pageSize");
            if (StringUtils.isEmpty(pageNum)){
                pageNum="1";
            }
            if (StringUtils.isEmpty(pageSize)){
                pageSize="30";
            }
            //设置分页
             //参数1 当前页(0开始) 参数2 每页条数
            nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum)-1,Integer.parseInt(pageSize)));


            //按照字段排序查询
            // 1 域  2 排序操作(升(ASC) 降(DESC))
            if (StringUtils.isNotEmpty(searchMap.get("sortField"))&& StringUtils.isNotEmpty(searchMap.get("sortRule"))){
                if ("ASC".equals(searchMap.get("sortRule"))){
                    //升序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.ASC));
                }else {
                    //降序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.DESC));
                }
            }

            //设置高亮域 和 高亮样式
            HighlightBuilder.Field field= new HighlightBuilder.Field("name")//高亮域
                    //前缀
                .preTags("<span style='color:red'>")
                    //后缀
                .postTags("</span>");

            nativeSearchQueryBuilder.withHighlightFields(field);




           //参数2(操作实体类)
           //参数3(查询结果操作对象)
            //封装查询
            AggregatedPage<SkuInfo> resultInfo = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
                @Override
                public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
                    //查询结果的操作
                    List<T> list= new ArrayList<>();
                    //查询结果
                    SearchHits hits = searchResponse.getHits();
                    if (hits != null){
                        //有结果
                        for (SearchHit hit : hits) {
                            //把SearchHit转化SkuInfo
                            SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);

                           // 替换高亮域
                            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                            if (highlightFields != null && highlightFields.size()>0){
                                //替换
                                skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                            }

                            list.add((T) skuInfo);
                        }
                    }
                    return new AggregatedPageImpl<T>(list,pageable,hits.getTotalHits(),searchResponse.getAggregations());
                }
            });


            //封装返回结果
            //总记录数
            resultMap.put("total",resultInfo.getTotalElements());
            //总页数
            resultMap.put("totalPages",resultInfo.getTotalPages());
            //数据集合
            resultMap.put("rows",resultInfo.getContent());
            //  封装品牌分组
            StringTerms brandTerms = (StringTerms) resultInfo.getAggregation(skuBrand);
            List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("brandList",brandList);

            //封装规格分组

            StringTerms specTerms = (StringTerms) resultInfo.getAggregation(skuSpec);
            List<String> specList = specTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("specList",this.formartSpec(specList));


            //封装当前页
            resultMap.put("pageNum",pageNum);

            return resultMap;

        }

        return null;
    }



    public Map<String, Set<String>> formartSpec(List<String> specList){
         Map<String,Set<String>> resultMap =new HashMap<>();
         if (specList !=null&& specList.size() > 0){
             for (String specJson : specList) {
                 // js数据转 map
                 Map<String,String> specMap = JSON.parseObject(specJson, Map.class);
                 for (String specKey : specMap.keySet()) {
                     Set<String> specSet = resultMap.get(specKey);
                     if (specSet==null){
                         specSet= new HashSet<String>();
                     }
                        specSet.add(specMap.get(specKey));
                     resultMap.put(specKey,specSet);
                 }
             }
         }
         return resultMap;
    }
}
